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Measurements of solar transition zone velocities and line broadening using the ultraviolet spectrometer and polarimeter on the Solar Maximum MissionThe UVSP instrument on SMM is able to observe solar regions at two wavelengths in the same line with a band-pass of 0.3 A. Intensity and Doppler velocity maps are derived. It is shown that the numerical values are sensitive to the adopted Doppler width and the range of velocities is limited to within 30 km/sec. A method called Double Dopplergram Determination (DDD) is described for deriving both the Doppler width and the velocity (up to 80 km/sec), and the main sources of uncertainties are discussed. To illustrate the method, a set of C IV 1548 A observations is analyzed according to this procedure. The mean C IV Doppler width measured (0.15 A) is comparable to previous determinations. A relation is found between bright regions and down-flows. Large Doppler widths correspond to strong velocity gradients.
Document ID
19830033826
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Simon, G.
(Observatoire de Paris-Meudon France)
Mein, P.
(Paris, Observatoire, Meudon Hauts-de-Seine, France)
Vial, J. C.
(CNRS, Laboratoire de Physique Stellaire et Planetaire, Verrieres-le-Buisson Essonne, France)
Shine, R. A.
(Observatoire de Paris-Meudon France)
Woodgate, B. E.
(NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
November 1, 1982
Publication Information
Publication: Astronomy and Astrophysics
Volume: 115
Issue: 2, No
Subject Category
Solar Physics
Accession Number
83A15044
Distribution Limits
Public
Copyright
Other

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